Codechange: Shuffle OrderList members to reduce size.

Size is reduced from 40 bytes to 32 bytes on 64 bit platforms.

src/order_base.h

@@ -261,11 +261,11 @@ private:
 	friend void AfterLoadVehicles(bool part_of_load); ///< For instantiating the shared vehicle chain
 	friend SaveLoadTable GetOrderListDescription(); ///< Saving and loading of order lists.
 
-	Order *first;                     ///< First order of the order list.
 	VehicleOrderID num_orders;        ///< NOSAVE: How many orders there are in the list.
 	VehicleOrderID num_manual_orders; ///< NOSAVE: How many manually added orders are there in the list.
 	uint num_vehicles;                ///< NOSAVE: Number of vehicles that share this order list.
 	Vehicle *first_shared;            ///< NOSAVE: pointer to the first vehicle in the shared order chain.
+	Order *first;                     ///< First order of the order list.
 
 	TimerGameTick::Ticks timetable_duration;         ///< NOSAVE: Total timetabled duration of the order list.
 	TimerGameTick::Ticks total_duration;             ///< NOSAVE: Total (timetabled or not) duration of the order list.
@@ -273,7 +273,7 @@ private:
 public:
 	/** Default constructor producing an invalid order list. */
 	OrderList(VehicleOrderID num_orders = INVALID_VEH_ORDER_ID)
-		: first(nullptr), num_orders(num_orders), num_manual_orders(0), num_vehicles(0), first_shared(nullptr),
+		: num_orders(num_orders), num_manual_orders(0), num_vehicles(0), first_shared(nullptr), first(nullptr),
 		  timetable_duration(0), total_duration(0) { }
 
 	/**